errclear 7 删除7天以前的记录

smit errclear

syslogd

unix普遍用到的日志系统，配置文件/etc/syslog.conf

没有什么多说的，比较普遍，定义的话是修改syslog.conf,保存的日志为文本格式

syslog.conf配置文件格式

信息类别.错误等级 记录的位置

其中,各项的含义

信息类别

auth used by authorization systems (login)

cron used for the cron and at systems

daemon system/netword daemon

kern produced by kernel messages

lpr printing system

mail mail system

mark internally used for time stamps

news reserved for the news system

user default facility, used for any program

uucp reserved for the uucp system

错误等级

debug normally used for debugging

info informational messages

notice conditions that may require attention

Warning any warnings

err any errors

crit critical conditions like hardware problems

Alert any condition that demand immediate attention

emerg any emergency condition

none Do not send messages from the indicated f

acility to the selected file.

记录的位置

可以是本地的文件（包括设备文件如/dev/console）或远程syslog日志服务器。

假如我要记录cron的所有错误信息，则可以在/etc/syslog.conf加入下面一行

cron.err /var/cronerr.log

定义记录cron的err信息到/var/cronerr.log文件